Cyanobacteria bloom, Lake Sunapee, NH (IMAGE) Dartmouth College Caption Cyanobacteria blooms damage the quality of lake water, affect lake communities, and can threaten human health. Credit Midge Eliassen Usage Restrictions Must credit: Midge Eliassen License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.